In a photo provided Saturday by the Shenyang Municipal Information Office, Liu Xia, center, the widow of Chinese dissident Liu Xiaobo, holds a portrait of him during his funeral. She stands with Liu Hui, her younger brother (left) and Liu Xiaoxuan, the younger brother of her late husband, who is holding his cremated remains. AP hide caption

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AP

A chair sat empty for Nobel Peace Prize winner Liu Xiaobo in Oslo, Norway, in 2010. The rights activist was imprisoned in China in 2009. Heiko Junge/AFP/Getty Images hide caption

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Heiko Junge/AFP/Getty Images

Protesters display portraits of jailed Chinese Nobel Peace Prize laureate Liu Xiaobo outside the Chinese liaison office in Hong Kong on Wednesday. Liu has expressed the wish to leave China for medical treatment, but the government has refused. Vincent Yu/AP hide caption

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Vincent Yu/AP

As China's Strength Has Grown, So Has Its Unwillingness To Let Dissidents Leave

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A video clip shows China's jailed Nobel Peace laureate Liu Xiaobo on a computer screen, lying on a bed receiving medical treatment at a hospital in Beijing. China says it has invited U.S. and German liver cancer experts to join a medical team treating Liu. Andy Wong/AP hide caption

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Andy Wong/AP

An undated photo provided by Voice of America shows Chinese dissident Liu Xiaobo, who won the 2010 Nobel Peace Prize. He was jailed in 2008 for promoting human rights. An amendment in Congress proposes renaming the street in front of the Chinese Embassy in Washington, D.C., in his honor. AP hide caption

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AP